Power output on-off control circuit

Abstract

The utility model relates to a power supply output on-off control circuit, comprising a jitter removing circuit connected with a start-stop switch and used for converting an electric signal generated by the start-stop switch into a pulse signal; and the D trigger is connected with the de-jitter circuit and is used for converting the pulse signal into a switching signal to control the on-off of a contactor so as to complete the on-off control of load power supply. According to the utility model, one switch is adopted to control on and off of load power supply, so that the number of switches is reduced, the reliability of the power supply is improved, and the cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power control technical field, especially a kind of power output on-off control circuit. BACKGROUND

[0002] When DC power supplies load, the output of load power supply needs to be controlled on-off. There are two kinds of traditional hardware circuit control methods. As shown in Figure 1 K1 is control switch, and K2 is output contactor (relay). K1 is self-locking switch, and when closed, contactor coil is connected, and contactor is attracted to supply load; when disconnected, contactor coil is turned off, and contactor is disconnected, and load power supply is cut off. The above-mentioned circuit has the advantages of simple circuit; the disadvantages are: if the switch is in the on state under the condition of power failure, the load will be directly powered after power on, which may cause danger.

[0003] Figure 2 It is another power output on-off control principle. K3 is disconnecting switch, which is normally closed point switch; K4 is connecting switch, which is normally open point switch. When K4 is pressed, VCC supplies power to double-group contact K1 relay coil through K3 and K4, K1 relay is attracted, one group of contacts connects K2 output contactor (relay), and the other group of contacts is connected in parallel with K4 switch, which locks K4 switch. When K4 switch is disconnected, VCC supplies power to K1 relay coil through K3 switch and one group of closed contacts of K1 relay, and keeps output load connected.

[0004] When stop switch K3 is pressed, K1 relay coil is disconnected, two groups of contacts are disconnected, K4 switch is unlocked, and K2 output contactor (relay) is disconnected, and output load power supply is cut off. After K3 is released, K1 relay coil is not changed in power supply state, K2 output contactor (relay) is in disconnected state, and output load power supply is not changed in disconnected state. This output control circuit uses two keys and double-pole double-throw relay to control the on-off of main switch, and the keys and relays are mechanical devices, so the circuit reliability is low, and faults are easy to occur in application process, which is not suitable for application in high-reliability products. UTILITY MODEL CONTENTS

[0005] To solve the above problems, the purpose of the utility model embodiment is to provide a kind of power output on-off control circuit.

[0006] A kind of power output on-off control circuit, comprising:

[0007] Debouncing circuit, connected with start-stop switch, for converting electric signal generated by start-stop switch into pulse signal;

[0008] The D flip-flop is connected with the de-bouncing circuit, and is used for converting a pulse signal into a switch signal to control on-off of the contactor, thereby completing on-off control of load power supply.

[0009] Preferably, the de-bouncing circuit comprises a first operational amplifier N1B, a second operational amplifier N1A, a first capacitor C1 and a first resistor R1.

[0010] The first operational amplifier N1B is connected with the start-stop switch K1 at a positive input end, and is connected with a reference voltage source at a negative input end;

[0011] The second operational amplifier N1A is connected with the output end of the first operational amplifier N1B at a positive input end, and is connected with a reference voltage source at a negative input end;

[0012] The first capacitor C1 is connected with the positive input end of the first operational amplifier N1B at one end, and is connected with the output end of the first operational amplifier N1B at the other end.

[0013] The first resistor R1 is connected with the positive input end of the first operational amplifier N1B at one end, and is connected with one end of the start-stop switch K1 at the other end, and the other end of the start-stop switch K1 is connected with a power supply VCC.

[0014] It should be noted that the 3-pin of the D flip-flop is connected with the positive input end of the second operational amplifier N1A, the 2-pin and the 5-pin of the D flip-flop are connected, the 1-pin of the D flip-flop is connected with the contactor, the coil of the contactor K2 is connected with the first end of the switch tube Q1, the second end of the switch tube Q1 is grounded, the control end of the switch tube Q1 is connected with the 1-pin of the D flip-flop, one end of the fourth resistor is connected with the 1-pin of the D flip-flop, and the other end of the fourth resistor is connected with the control end of the switch tube Q1.

[0015] According to the specific embodiment of the utility model, the utility model discloses the following technical effects:

[0016] The utility model relates to a kind of power output on-off control circuit, compared with prior art, the utility model uses a switch to control the on and off of load power supply, compared with the above-mentioned first traditional hardware control circuit solves the harm of automatic output when power on;Compared with the second traditional hardware control circuit, electronic device control is used, and circuit reliability is high, cost is reduced.

[0017] In order to make the above object, features and advantages of the present application more obvious, the following preferred embodiments are described in detail, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 The first traditional hardware on-off control principle diagram provided by the present application;

[0020] Figure 2 Another traditional hardware on-off control principle diagram provided by the present application;

[0021] Figure 3 The power output on-off control circuit principle diagram provided by the present application;

[0022] Figure 4 The signal waveform schematic diagram provided by the present application. DETAILED DESCRIPTION

[0023] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0025] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on terms should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connect;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can pass through intermediate medium indirectly connect, can be two element inside intercommunication.For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.

[0026] Please refer to Figure 3 A power output on-off control circuit, comprising:

[0027] Debouncing circuit, with start-stop switch is connected, for the start-stop switch generates electric signal conversion pulse signal;

[0028] D flip-flop, with the debouncing circuit is connected, for pulse signal conversion switch signal, to control the on-off of contactor, to complete the on-off control of load power supply.

[0029] Further, the debouncing circuit, comprising: first operational amplifier N1B, second operational amplifier N1A, first capacitor C1, start-stop switch K1 and first resistance R1.

[0030] First operational amplifier N1B, the positive input end of first operational amplifier N1B is connected with start-stop switch K1, the negative input end of first operational amplifier N1B is used for being connected with reference voltage source;Second operational amplifier N1A, the positive input end of second operational amplifier N1A is connected with the output end of first operational amplifier N1B, and the negative input end of second operational amplifier N1A is used for being connected with reference voltage source;

[0031] First capacitor C1, one end of first capacitor C1 is connected with the positive input end of first operational amplifier N1B, and the other end of first capacitor C1 is connected with the output end of first operational amplifier N1B.First resistance R1, one end of first resistance R1 is connected with the positive input end of first operational amplifier N1B, one end of first resistance R1 is connected with one end of start-stop switch K1, and the other end of start-stop switch K1 is used for being connected with power supply VCC.

[0032] Need to explain, the 3 pin of the D flip-flop is connected with the positive input end of the second operational amplifier N1A, the 2 pin of the D flip-flop is connected with the 5 pin, the 1 pin of the D flip-flop is used to be connected with the contactor.The coil of the contactor K2 is connected with the first end of the switch tube Q1, the second end of the switch tube Q1 is grounded, the control end of the switch tube Q1 is connected with the 1 pin of the D flip-flop.The one end of the fourth resistance is connected with the 1 pin of the D flip-flop, and the other end of the fourth resistance is connected with the control end of the switch tube Q1.

[0033] By Figures 3-4 It can be known that N1 is an operational amplifier, N2 is a D flip-flop, and K1 is a start-stop switch.N1 chip is composed of two operational amplifiers N1A and N1B.N1B is a de-bouncing circuit.When K1 button is pressed, the voltage of the 5 pin of N1B operational amplifier rises from 0V, and when the voltage is higher than the voltage of the 6 pin of N1B operational amplifier, the voltage of the 7 pin of N1B operational amplifier changes from low level to high level, and the high level signal is connected to the 3 pin of N1A operational amplifier, compared with the voltage of the 2 pin of N1A operational amplifier, the output of the 1 pin of N1A operational amplifier changes from low level to high level.When K1 button is released, the voltage of the 5 pin of N1B operational amplifier gradually decreases, and when the voltage is lower than the voltage of the 6 pin of N1B operational amplifier, the voltage of the 7 pin of N1B operational amplifier changes from high level to low level, and the low level signal is connected to the 3 pin of N1A operational amplifier, compared with the voltage of the 2 pin of N1A operational amplifier, the output of the 1 pin of N1A operational amplifier changes from high level to low level.In this way, after K1 jog button is pressed and released, the 1 pin of N1A operational amplifier will output a pulse signal, and the pulse signal is connected to the 3 pin of N2 chip.

[0034] N2 is a D flip-flop, and after power-on initialization, the 1 pin outputs low level.After connecting the 2 pin and the 5 pin of N2 chip, a frequency dividing circuit is formed, and when the 3 pin of N2 has a rising edge pulse trigger, the output level of the 1 pin changes from low level to high level;when the 3 pin of N2 has a rising edge pulse trigger again, the output level of the 1 pin changes from high level to low level.Single-button output on-off control is realized.

[0035] The utility model adopts a switch to control the turn-on and turn-off of load power supply, which not only reduces the number of switches, improves the reliability of power supply, but also saves cost.

[0036] The above is only a specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of changes or alternative technical solutions within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A power output on / off control circuit, characterized in that, include: The debounce circuit, connected to the start / stop switch, is used to convert the electrical signal generated by the start / stop switch into a pulse signal. The D flip-flop, connected to the debounce circuit, is used to convert pulse signals into switching signals to control the on / off state of the contactor, thereby completing the on / off control of the load power supply.

2. The power output on / off control circuit according to claim 1, characterized in that, The debounce circuit includes: The first operational amplifier (N1B) has its positive input terminal connected to the start / stop switch (K1) and its inverting input terminal connected to a reference voltage source. The second operational amplifier (N1A) has its positive input terminal connected to the output terminal of the first operational amplifier (N1B), and its inverting input terminal connected to a reference voltage source. The first capacitor (C1) has one end connected to the positive input terminal of the first operational amplifier (N1B), and the other end connected to the output terminal of the first operational amplifier (N1B).

3. The power output on / off control circuit according to claim 2, characterized in that, Also includes: A first resistor (R1) is connected at one end to the positive input terminal of the first operational amplifier (N1B) and at the other end to a start / stop switch (K1). The other end of the start / stop switch (K1) is connected to the power supply (VCC).

4. The power output on / off control circuit according to claim 3, characterized in that, Pin 3 of the D flip-flop is connected to the positive input of the second operational amplifier (N1A), pin 2 of the D flip-flop is connected to pin 5, and pin 1 of the D flip-flop is used to connect to a contactor.

5. The power output on / off control circuit according to claim 4, characterized in that, The coil of the contactor (K2) is connected to the first terminal of the switching transistor (Q1), the second terminal of the switching transistor (Q1) is grounded, and the control terminal of the switching transistor (Q1) is connected to pin 1 of the D flip-flop.

6. The power output on / off control circuit according to claim 5, characterized in that, Also includes: The fourth resistor has one end connected to pin 1 of the D flip-flop and the other end connected to the control terminal of the switching transistor (Q1).

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